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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b3809dddcba4753df9b66f6653f24cd261c3281c2d8d9eae08ee107d4241f8' 
  AND token = 'EzezK/Qxq2uMUwgU90ASjcVDrkLpoHiz+0qvP2cM5xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}